Zhangjiakou

Zhāngjiākǒu, also known also by several other names, is a prefecture-level city in northwestern Hebei province of North China, adjacent to Beijing to the southeast. Its administrative area has a population of 4.35 million, and covers 36,947 square kilometres (14,265 sq mi). The urban area of Zhangjiakou is divided into Qiaoxi and Qiaodong Districts which have 473,193 inhabitants in 2010, but the prefecture-level city is much larger, spanning around 36,800 square kilometres (14,200 sq mi).